Why did einstein urge the president to authorize the manhattan project

In japan, the is the head of state and the is the head of government. who ever answer will get

Which of the following was a difficulty faced by the ottoman empire in the 1700s and 1800s?   a.  financial independence      b.  lack of trained artisans      c.  refusal to trade with other nations      d.  rebelling ethnic groups

What is the name for the main idea behind the settling of western lands by americans in the early-1800s?